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Dragon Go Server is a web-based server for playing go (a.k.a baduk, weichi and igo). It's intended as a replacement for play-by-email, where the server keeps tracks of the moves. Tools used are php and mysql.
A PHP Web Application that you can install on your own web server. It allows you to play chess with other users across the internet or sitting at the same screen. It only permits valid moves and can automatically detect check and checkmate status.
Diplomacy is a popular turn based strategy game in which you battle to control Europe; to win you must be diplomatic and strategic. webDiplomacy lets you play Diplomacy online. Official game server: http://webdiplomacy.net/
Math game where up to 4 students can play online against each other. By moving their figurines around a colorful pseudo 3D board, players answer math questions and can play tricks against their opponents. Client and server distributed under Affero GPL 1.